and the republican vp nominee, paul ryan, weighed in during a rally on this same topic late today in iowa. >> vice president biden just today said that the middle class over the last four years has been, quote, buried. we agree. that means we need romney in denver, colorado. before we get to carl, we want to go to ed henry live with the president in las vegas tonight's. how is the prep going for the big deal tomorrow night? good evening. >> it's been hours of debate prep. it's been intense. they're being very tight lipped about what the president is doing to practice. but he tried to get out today from the resort he's staying at in henderson, nevada. he went to the hoover dam for the first time in his life. maybe get a fresh air or do thinking before tomorrow's first showdown face-to-face with mitt romney. interesting, you mentioned vice president biden was speaking for the president, kind of slipped up by suggesting the middle class has been buried the last four years. so he clarified. >> the middle class was buried by the policies of romney and ryan supported as bill clinton said a